Icheon Seo clan (Korean: 이천 서씨; Hanja: 利川 徐氏) is one of the Korean clans.

Their Bon-gwan is in Icheon, Gyeonggi Province.

According to the research held in 2015, the number of Icheon Seo clan was 199792.

Their founder was Sŏ Sin-il [ko] who was a descendant of King Jun of Gojoseon, the Gija Joseon’s last king.

He lived at seoaseong (Korean: 서아성; Hanja: 徐阿城) in Icheon.